minor change for build test

Detector/DetCEPCv4/compact/README.md

@@ -20,10 +20,10 @@ The following CEPC_v4 detector models are available in CEPCSW
          - TPC_outer_radius = 1808*mm
  - EndcapTracker
          - with silicon pestals (FTDPixel + FTDStrip)
- - Ecal (un-implemented)
+ - Ecal
          - with si-W calorimeter
- - Hcal (un-implemented)
-         - with scintillator **and** RPC readout
-         - creates two sets of hit collections
+ - Hcal
+         - with RPC readout
+         - creates three sets of hit collections
  - compact files:
          - only Tracker [./CEPC_v4.xml](./CEPC_v4.xml)